Functions of the PU4 module
Overview
The Processing Unit PU4 is the central control module of the SWT 3000 unit.
The protection commands are received via an interface module IFC-D or IFC-P and/or an EN100 module.
At the transmit side, PU4 converts protection commands or commands at digital transmission lines into one
of the following cases:
•
Tones of a defined frequency
•
A digital code in case of digital transmission
If the PU4 is housed in a stand-alone SWT 3000 unit, the commands are transmitted to the remote station by:
•
analog transmission via CLE and/or
•
digital transmission via the Digital Line Interfaces (LID) and/or
•
digital transmission via fiber-optic module (FOM)
It is also possible to transmit commands of a stand-alone SWT 3000 unit via a PowerLink PLC system by:
•
connecting the CLE with a VFx- Interface of the PowerLink or
•
a fiber-optic connection with FOM modules in SWT 3000 and PowerLink
The PU4 of an integrated (i)SWT 3000 unit in a PowerLink PLC system is processing the commands via the CSPi
for transmission via the high voltage line of the PLC link. Optionally a digital transmission via the LID- Interface
is possible with additional digital transmission lines, e.g. for a secondary transmission path.
7.1
7.1.1
Processing Unit Module
7.1 Functions of the PU4 module
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Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020